The Vorax, like the Vikingr, are a raider warrior culture [the actual name of the species is something different. Vorax is an occupation] but like most tribal lots, they're fiercely protective of their own and treat all outsiders like enemies.

It's more than a shock for them to find an enemy rescuing their children. The Human acted with a warrior's honour and a weird set of morals of their own. So of course they're not hurting this Human. Today.